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definition: Clustering algorithms partition a set of objects into groups or clusters. The task of clustering (e.g. document clustering) is to create, or discover, a reasonable set of clusters for a given set of data types (e.g. documents). By contrast, the categorization task is to assign a new data type (e.g. a document) to one, or more, of a pre-existing set of classes (e.g. document classes).
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  • List of projects by the doremi research group (Doremi projects)
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Classical book of C.J. van Rijsbergen as Hypertext/CD-ROM version

Recent trends in hierarchical document clustering: a critical review.
P. Willet.
Information Processing and Management. 1988. 577-597.